Data Binding 101 Expression Syntax: Listing 1
IDataError Implementation.
- By Nick Randolph
- 10/29/2012
public class Person:INotifyPropertyChanged, IDataErrorInfo
{
public string Error
{
get
{
var attributes = new[] { "Title", "Name" };
foreach (var attribute in attributes)
{
var error = this[attribute];
if (!string.IsNullOrWhiteSpace(error)) return error;
}
return string.Empty;
}
}
public string this[string columnName]
{
get
{
switch (columnName)
{
case "Title":
return string.Empty;
case "Name":
return !string.IsNullOrWhiteSpace(Name) ? string.Empty : "Need to specify name";
default:
return string.Empty;
}
}
}
...
}
About the Author
Nick Randolph runs Built to Roam, a consulting company that specializes in training, mentoring and assisting other companies build mobile applications. With a heritage in rich client applications for both the desktop and a variety of mobile platforms, Nick currently presents, writes and educates on the Windows Phone platform.